koffice/lib/kofficecore/KoQueryTrader.h

/* This file is part of the KDE project
   Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/

#ifndef __ko_query_trader_h__
#define __ko_query_trader_h__

#include <kservice.h>
#include <ksharedptr.h>
#include <tqvaluelist.h>
#include <koffice_export.h>

class TQObject;
class TQStringList;
class KoDocument;
class KoFilter;
class KoFilterChain;

/**
 *  Represents an available KOffice component
 *  that supports the document interface.
 */
class KOFFICECORE_EXPORT KoDocumentEntry
{

public:
  KoDocumentEntry() { m_service = 0L; } // for TQValueList
  KoDocumentEntry( KService::Ptr service );
  ~KoDocumentEntry() { }

  KService::Ptr service() const { return m_service; }

  /**
   * @return TRUE if the service pointer is null
   */
  bool isEmpty() const { return m_service == 0L; }

  /**
   * @return name of the associated service
   */
  TQString name() const { return m_service->name(); }

  /**
   *  Mimetypes (and other service types) which this document can handle.
   */
  TQStringList mimeTypes() const { return m_service->serviceTypes(); }

  /**
   *  @return TRUE if the document can handle the requested mimetype.
   */
  bool supportsMimeType( const TQString & _mimetype ) const
  { return mimeTypes().contains( _mimetype ); }

  /**
   *  Uses the factory of the component to create
   *  a document. If that is not possible, 0 is returned.
   */
  KoDocument* createDoc( KoDocument* parent = 0, const char* name = 0 ) const;

  /**
   *  This function will query ksycoca to find all available components.
   *  The result will only contain parts, which are embeddable into a document
   *
   *  @param _constr is a constraint expression as used by KTrader.
   *                 You can use it to set additional restrictions on the available
   *                 components.
   */
  static TQValueList<KoDocumentEntry> query( const TQString &  _constr = TQString() );

  /**
   *  This function will query the system to find all available filters.
   *
   *  @param _onlyDocEmb specifies if only KOffice Parts should be listed which are
   *                 embeddable into other koDocuments, or all (if false)
   *                 (eg.: it makes no sense to embed Kexi into KWord,
   *                 but it makes sense to embed it into KoShell)
   *  @param _constr is a constraint expression as used by KDEDs trader interface.
   *                 You can use it to set additional restrictions on the available
   *                 components.
   */
  // ### TODO: MERGE WITH ABOVE METHODE WHEN BIC+SIC CHANGES ARE ALLOWED
  static TQValueList<KoDocumentEntry> query( bool _onlyDocEmb,const TQString& _constr);
  /* this is how the signature should be looking after merging
  static TQValueList<KoDocumentEntry> query( bool _onlyDocEmb =true, const TQString& _constr = TQString() );
  or better: use an enum for the first arg.
  */


  /**
   *  This is a convenience function.
   *
   *  @return a document entry for the KOffice component that supports
   *          the requested mimetype and fits the user best.
   */
  static KoDocumentEntry queryByMimeType( const TQString & mimetype );

private:
  KService::Ptr m_service;
};

/**
 *  Represents an available filter.
 */
class KoFilterEntry : public KShared
{

public:
  typedef KSharedPtr<KoFilterEntry> Ptr;

  KoFilterEntry() : weight( 0 ) { m_service = 0L; } // for TQValueList
  KoFilterEntry( KService::Ptr service );
  ~KoFilterEntry() { }

  KoFilter* createFilter( KoFilterChain* chain, TQObject* parent = 0, const char* name = 0 );

  /**
   *  The imported mimetype(s).
   */
  TQStringList import;

  /**
   *  The exported mimetype(s).
   */
  TQStringList export_;

  /**
   *  The "weight" of this filter path. Has to be > 0 to be valid.
   */
  unsigned int weight;

  /**
   *  Do we have to check during runtime?
   */
  TQString available;

  /**
   *  @return TRUE if the filter can import the requested mimetype.
   */
  bool imports( const TQString& _mimetype ) const
  { return ( import.contains( _mimetype ) ); }

  /**
   *  @return TRUE if the filter can export the requested mimetype.
   */
  bool exports( const TQString& _m ) const
  { return ( export_.contains( _m ) ); }

  /**
   *  This function will query KDED to find all available filters.
   *
   *  @param _constr is a constraint expression as used by KDEDs trader interface.
   *                 You can use it to set additional restrictions on the available
   *                 components.
   */
  static TQValueList<KoFilterEntry::Ptr> query( const TQString& _constr = TQString() );

  KService::Ptr service() const { return m_service; }

private:
  KService::Ptr m_service;
};

#endif